Who was David Lewis?

"David Lewis (1941-2001) was one of the most important philosophers of the 20th Century. He made significant contributions to philosophy of language, philosophy of mathematics, philosophy of science, decision theory, epistemology, meta-ethics and aesthetics."— Brian Weatherson

To learn more about him and his work, you can begin with Weatherson's entry in the Stanford Encyclopedia of Philosophy or his Wikipedia page.

Stanford Encyclopedia Entry

David Lewis wikipedia